A random sample of 30 textbooks has a mean price of $120 and a standard deviation of $12. Find a 95% confidence interval for the mean price of all…

A random sample of 30 textbooks has a mean price of $120 and a standard deviation of $12.

Find a 95% confidence interval for the mean price of all textbooks.

Then find a 95% confidence interval if the sample size were 100 and compare your results.

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